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session_timer.go
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session_timer.go
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package usecase
import (
"context"
"errors"
"fmt"
"time"
"github.com/camphor-/relaym-server/domain/entity"
"github.com/camphor-/relaym-server/domain/event"
"github.com/camphor-/relaym-server/domain/repository"
"github.com/camphor-/relaym-server/domain/service"
"github.com/camphor-/relaym-server/domain/spotify"
"github.com/camphor-/relaym-server/log"
)
var waitTimeAfterHandleTrackEnd = 7 * time.Second
var waitTimeAfterHandleSkipTrack = 300 * time.Millisecond
type SessionTimerUseCase struct {
tm *entity.SyncCheckTimerManager
sessionRepo repository.Session
playerCli spotify.Player
pusher event.Pusher
}
func NewSessionTimerUseCase(sessionRepo repository.Session, playerCli spotify.Player, pusher event.Pusher, tm *entity.SyncCheckTimerManager) *SessionTimerUseCase {
return &SessionTimerUseCase{tm: tm, sessionRepo: sessionRepo, playerCli: playerCli, pusher: pusher}
}
// startTrackEndTrigger は曲の終了やストップを検知してそれぞれの処理を実行します。 goroutineで実行されることを想定しています。
func (s *SessionTimerUseCase) startTrackEndTrigger(prevCtx context.Context, sessionID string) {
ctx := service.NewBackgroundContextFromContext(prevCtx)
logger := log.New()
logger.Debugj(map[string]interface{}{"message": "start track end trigger", "sessionID": sessionID})
// 曲の再生を待つ
waitTimer := time.NewTimer(5 * time.Second)
currentOperation := operationPlay
triggerAfterTrackEnd := s.tm.CreateExpiredTimer(sessionID)
for {
select {
case <-waitTimer.C:
if err := s.handleWaitTimerExpired(ctx, sessionID, triggerAfterTrackEnd, currentOperation); err != nil {
return
}
case <-triggerAfterTrackEnd.StopCh():
logger.Infoj(map[string]interface{}{"message": "stop timer", "sessionID": sessionID})
waitTimer.Stop()
s.deleteTimer(sessionID)
return
case <-triggerAfterTrackEnd.NextCh():
logger.Debugj(map[string]interface{}{"message": "call to move next track", "sessionID": sessionID})
waitTimer.Stop()
nextTrack, err := s.handleNext(ctx, sessionID)
if err != nil {
if errors.Is(err, entity.ErrSessionPlayingDifferentTrack) {
logger.Infoj(map[string]interface{}{"message": "handleTrackEnd detects interrupt", "sessionID": sessionID, "error": err.Error()})
return
}
logger.Errorj(map[string]interface{}{"message": "handleTrackEnd with error", "sessionID": sessionID, "error": err.Error()})
return
}
if !nextTrack {
logger.Infoj(map[string]interface{}{"message": "no next track", "sessionID": sessionID})
return
}
waitTimer = time.NewTimer(waitTimeAfterHandleSkipTrack)
currentOperation = operationNextTrack
case <-triggerAfterTrackEnd.ExpireCh():
triggerAfterTrackEnd.MakeIsTimerExpiredTrue()
logger.Debugj(map[string]interface{}{"message": "trigger expired", "sessionID": sessionID})
nextTrack, err := s.handleTrackEnd(ctx, sessionID)
if err != nil {
if errors.Is(err, entity.ErrSessionPlayingDifferentTrack) {
logger.Infoj(map[string]interface{}{"message": "handleTrackEnd detects interrupt", "sessionID": sessionID, "error": err.Error()})
return
}
logger.Errorj(map[string]interface{}{"message": "handleTrackEnd with error", "sessionID": sessionID, "error": err.Error()})
return
}
if !nextTrack {
logger.Infoj(map[string]interface{}{"message": "no next track", "sessionID": sessionID})
return
}
waitTimer = time.NewTimer(waitTimeAfterHandleTrackEnd)
currentOperation = operationNextTrack
}
}
}
func (s *SessionTimerUseCase) handleWaitTimerExpired(ctx context.Context, sessionID string, triggerAfterTrackEnd *entity.SyncCheckTimer, currentOperation currentOperation) error {
logger := log.New()
logger.Debugj(map[string]interface{}{"message": "currentOperation", "currentOperation": currentOperation})
playingInfo, err := s.playerCli.CurrentlyPlaying(ctx)
if err != nil {
logger.Errorj(map[string]interface{}{
"message": "handleWaitTimerExpired: failed to get currently playing info",
"sessionID": sessionID,
"error": err.Error(),
})
return fmt.Errorf("failed to get currently playing info")
}
sess, err := s.sessionRepo.FindByID(ctx, sessionID)
if err != nil {
logger.Errorj(map[string]interface{}{
"message": "handleWaitTimerExpired: failed to get session",
"sessionID": sessionID,
"error": err.Error(),
})
return fmt.Errorf("failed to get session from repo")
}
if err := sess.IsPlayingCorrectTrack(playingInfo); err != nil {
s.handleInterrupt(sess)
if err := s.sessionRepo.Update(ctx, sess); err != nil {
logger.Errorj(map[string]interface{}{
"message": "handleWaitTimerExpired: failed to update session after IsPlayingCorrectTrack and handleInterrupt",
"sessionID": sessionID,
"error": err.Error(),
})
return fmt.Errorf("failed to update session")
}
return fmt.Errorf("session interrupt")
}
switch currentOperation {
case operationNextTrack:
s.pusher.Push(&event.PushMessage{
SessionID: sess.ID,
Msg: entity.NewEventNextTrack(sess.QueueHead),
})
}
// ぴったしのタイマーをセットすると、Spotifyでは次の曲の再生が始まってるのにRelaym側では次の曲に進んでおらず、
// INTERRUPTになってしまう
remainDuration := playingInfo.Remain() - 2*time.Second
logger.Infoj(map[string]interface{}{
"message": "start timer", "sessionID": sessionID, "remainDuration": remainDuration.String(),
})
triggerAfterTrackEnd.SetDuration(remainDuration)
return nil
}
// handleTrackEnd はある一曲の再生が終わったときの処理を行います。
func (s *SessionTimerUseCase) handleTrackEnd(ctx context.Context, sessionID string) (bool, error) {
triggerAfterTrackEndResponse, err := s.sessionRepo.DoInTx(ctx, s.handleTrackEndTx(sessionID))
if v, ok := triggerAfterTrackEndResponse.(*handleTrackEndResponse); ok {
// これはトランザクションが失敗してRollbackしたとき
if err != nil {
return false, fmt.Errorf("handle track end in transaction: %w", err)
}
return v.nextTrack, v.err
}
// これはトランザクションが失敗してRollbackしたとき
if err != nil {
return false, fmt.Errorf("handle track end in transaction: %w", err)
}
return false, nil
}
// handleNext は曲がスキップされたときの処理を行います。
func (s *SessionTimerUseCase) handleNext(ctx context.Context, sessionID string) (bool, error) {
triggerAfterTrackEndResponse, err := s.sessionRepo.DoInTx(ctx, s.handleNextTx(sessionID))
if v, ok := triggerAfterTrackEndResponse.(*handleTrackEndResponse); ok {
// これはトランザクションが失敗してRollbackしたとき
if err != nil {
return false, fmt.Errorf("handle track end in transaction: %w", err)
}
return v.nextTrack, v.err
}
// これはトランザクションが失敗してRollbackしたとき
if err != nil {
return false, fmt.Errorf("handle track end in transaction: %w", err)
}
return false, nil
}
// handleTrackEndTx はINTERRUPTになってerrorを帰す場合もトランザクションをコミットして欲しいので、
// アプリケーションエラーはhandleTrackEndResponseのフィールドで返すようにしてerrorの返り値はnilにしている
func (s *SessionTimerUseCase) handleTrackEndTx(sessionID string) func(ctx context.Context) (interface{}, error) {
logger := log.New()
return func(ctx context.Context) (_ interface{}, returnErr error) {
sess, err := s.sessionRepo.FindByIDForUpdate(ctx, sessionID)
if err != nil {
return &handleTrackEndResponse{nextTrack: false}, fmt.Errorf("find session id=%s: %v", sessionID, err)
}
defer func() {
if err := s.sessionRepo.Update(ctx, sess); err != nil {
if returnErr != nil {
returnErr = fmt.Errorf("update session id=%s: %v: %w", sess.ID, err, returnErr)
} else {
returnErr = fmt.Errorf("update session id=%s: %w", sess.ID, err)
}
}
}()
if sess.StateType == entity.Archived {
return s.handleArchiveInTransaction(sessionID)
}
if err := sess.GoNextTrack(); err != nil && errors.Is(err, entity.ErrSessionAllTracksFinished) {
s.handleAllTrackFinish(sess)
return &handleTrackEndResponse{
nextTrack: false,
err: nil,
}, nil
}
res, err := s.enqueueTrackInTransaction(ctx, sess)
if res != nil {
return res, err
}
logger.Debugj(map[string]interface{}{"message": "next track", "sessionID": sess.ID, "queueHead": sess.QueueHead})
return &handleTrackEndResponse{nextTrack: true, err: nil}, nil
}
}
// handleNextTx はINTERRUPTになってerrorを帰す場合もトランザクションをコミットして欲しいので、
// アプリケーションエラーはhandleTrackEndResponseのフィールドで返すようにしてerrorの返り値はnilにしている
func (s *SessionTimerUseCase) handleNextTx(sessionID string) func(ctx context.Context) (interface{}, error) {
logger := log.New()
return func(ctx context.Context) (_ interface{}, returnErr error) {
sess, err := s.sessionRepo.FindByIDForUpdate(ctx, sessionID)
if err != nil {
return &handleTrackEndResponse{nextTrack: false}, fmt.Errorf("find session id=%s: %v", sessionID, err)
}
defer func() {
if err := s.sessionRepo.Update(ctx, sess); err != nil {
if returnErr != nil {
returnErr = fmt.Errorf("update session id=%s: %v: %w", sess.ID, err, returnErr)
} else {
returnErr = fmt.Errorf("update session id=%s: %w", sess.ID, err)
}
}
}()
if err := s.playerCli.GoNextTrack(ctx, sess.DeviceID); err != nil {
return &handleTrackEndResponse{nextTrack: false}, fmt.Errorf("GoNextTrack: %w", err)
}
if sess.StateType == entity.Archived {
return s.handleArchiveInTransaction(sessionID)
}
if err := sess.GoNextTrack(); err != nil && errors.Is(err, entity.ErrSessionAllTracksFinished) {
s.handleAllTrackFinish(sess)
return &handleTrackEndResponse{
nextTrack: false,
err: nil,
}, nil
}
res, err := s.enqueueTrackInTransaction(ctx, sess)
if res != nil {
return res, err
}
logger.Debugj(map[string]interface{}{"message": "next track", "sessionID": sess.ID, "queueHead": sess.QueueHead})
return &handleTrackEndResponse{nextTrack: true, err: nil}, nil
}
}
func (s *SessionTimerUseCase) handleArchiveInTransaction(sessionID string) (*handleTrackEndResponse, error) {
s.pusher.Push(&event.PushMessage{
SessionID: sessionID,
Msg: entity.EventArchived,
})
return &handleTrackEndResponse{
nextTrack: false,
err: nil,
}, nil
}
func (s *SessionTimerUseCase) enqueueTrackInTransaction(ctx context.Context, sess *entity.Session) (*handleTrackEndResponse, error) {
logger := log.New()
track := sess.TrackURIShouldBeAddedWhenHandleTrackEnd()
if track != "" {
if err := s.playerCli.Enqueue(ctx, track, sess.DeviceID); err != nil {
s.handleInterrupt(sess)
if err := s.sessionRepo.Update(ctx, sess); err != nil {
logger.Errorj(map[string]interface{}{
"message": "handleWaitTimerExpired: failed to update session after Enqueue and handleInterrupt",
"sessionID": sess.ID,
"error": err.Error(),
})
return &handleTrackEndResponse{err: err}, fmt.Errorf("failed to enqueue track")
}
return &handleTrackEndResponse{nextTrack: false, err: nil}, nil
}
}
return nil, nil
}
// handleAllTrackFinish はキューの全ての曲の再生が終わったときの処理を行います。
func (s *SessionTimerUseCase) handleAllTrackFinish(sess *entity.Session) {
logger := log.New()
logger.Debugj(map[string]interface{}{"message": "all track finished", "sessionID": sess.ID})
s.pusher.Push(&event.PushMessage{
SessionID: sess.ID,
Msg: entity.EventStop,
})
}
// handleInterrupt はSpotifyとの同期が取れていないときの処理を行います。
func (s *SessionTimerUseCase) handleInterrupt(sess *entity.Session) {
logger := log.New()
logger.Debugj(map[string]interface{}{"message": "interrupt detected", "sessionID": sess.ID})
sess.MoveToStop()
s.pusher.Push(&event.PushMessage{
SessionID: sess.ID,
Msg: entity.EventInterrupt,
})
}
func (s *SessionTimerUseCase) existsTimer(sessionID string) bool {
_, exists := s.tm.GetTimer(sessionID)
return exists
}
func (s *SessionTimerUseCase) deleteTimer(sessionID string) {
s.tm.DeleteTimer(sessionID)
}
func (s *SessionTimerUseCase) isTimerExpired(sessionID string) (bool, error) {
return s.tm.IsTimerExpired(sessionID)
}
func (s *SessionTimerUseCase) sendToNextCh(sessionID string) error {
return s.tm.SendToNextCh(sessionID)
}
type handleTrackEndResponse struct {
nextTrack bool
err error
}
type currentOperation string
const (
operationPlay currentOperation = "play"
operationNextTrack currentOperation = "NextTrack"
)